I’m travelling AMS-LHR-JFK on BA in CE and then on AA in J. I’d like to order a special meal (Asian vegetarian) just for the AA LHR-JFK leg but not order anything special for the BA AMS-LHR leg. This is because, perhaps like many here, I much prefer BA’s food to AA’s own catering and I expect that a curry from LHR will be much better than AA’s own menus.

How do I do this without ending up specifying an AVML for the BA AMS-LHR leg as well?